So in my campaign I want to eventually pit my players against the feared Mold Men of 2nd edition. I know i have a lot of updating I need to do and I want to change some things, but here is a small sample

My Mold men will possess tremorsense, since they will not be able to speak. They will have regeneration (except to fire and acid), and Damage resistance 20/ slashing or Piercing. They will also possess the ability to create spawn, though it will be time consuming.

So,1. What should their challenge rating be, assuming they are based on having 1 Hd?2. Should the resist elect., cold, magic, etc.?3. Are there any other things you wonder about that I could clarify?

edit: I have decided to add Water sensitivity in order to offset some of this. When immersed in water, or in conditions of moderate to heavy rain or snow, their DR drops to 10.

Yeah, that would come in very handy. I hadn't though of it that way. I guess if you had planned on increasing the HD all along it would be a realy good idea for the kind of monster you can throw at the PCs in gangs and groups, with higher HD specimens as the leaders.

High problem solving capacity, but little upper level reasoning. Concepts like morality, emotion, fear, anger and hope mean little, but survival is paramount. I was thinking about changing their type to "plant", but that's not entirely accurate.